Elevator connected through ball joint

Abstract

The utility model relates to an elevator connected by a ball joint, which comprises a frame, and a carrier, an upper bearing seat, a lower bearing seat, a ball screw, a ball nut, a ball joint connecting component and a driving component which are arranged on the frame, and the upper bearing seat and the lower bearing seat are symmetrically arranged on the upper side and the lower side of the frame; the ball screw is arranged on the upper bearing seat and the lower bearing seat, the ball nut is arranged on the ball screw in a sleeved mode, the carrier is connected with the ball nut through the ball joint connecting assembly, and the driving assembly drives the ball screw to rotate. The ball joint connecting assembly is additionally arranged between the carrier and the ball nut, so that the internal stress borne by the ball screw pair is effectively released, and the working safety of the elevator is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of hoist connected with ball joint. BACKGROUND

[0002] Current electric hoist mostly adopts ball screw to drive, for example, a kind of small hoist of motor drive of the public number CN 207903833U, including rack, motor, ball screw, lifting support frame;The rack is rectangular frame structure;The ball screw is installed on the rack, and is arranged along vertical direction;Motor is installed at one end of the ball screw, and the motor drives the ball screw to rotate;Ball nut is movably sleeved on the ball screw;The lifting support frame is installed on the ball screw by the ball nut, and the motor drives the ball screw to rotate, thereby driving the lifting support frame to move along the ball screw axial direction.This hoist is simple and reasonable in structure, convenient to use, low noise, stable operation, high positioning accuracy, good flexibility, can quickly realize upgrade transportation, easy to maintain, low in manufacturing and maintenance cost, but because ball nut and lifting support frame are rigidly connected, there is certain error when processing and assembling, which makes the installed ball screw bear internal stress caused by error and cannot be released, the friction force of whole screw pair increases, ball nut is prone to wear and failure, there is certain security risk, and the friction force of ball screw pair increases also increases the load torque of servo motor, the failure rate of equipment also increases, and then the maintenance difficulty of equipment later period is increased. SUMMARY

[0003] This section aims to outline some aspects of the embodiments of the present utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0004] The technical problem to be solved by the utility model is how to avoid the problem of wear and failure of ball screw pair due to internal stress that cannot be released when hoist is working.

[0005] To solve the above technical problems, the utility model provides technical scheme as follows: A kind of hoist connected with ball joint, including frame and the carrier, upper bearing seat, lower bearing seat, ball screw, ball nut, ball joint connecting assembly and driving assembly being arranged on frame, the upper bearing seat and lower bearing seat are symmetrically arranged on the upper and lower sides of the frame, the ball screw is arranged on the upper bearing seat and lower bearing seat, the ball nut is sleeved on the ball screw, the carrier is connected with the ball nut by the ball joint connecting assembly, the driving assembly drives the ball screw rotation.

[0006] As a preferred scheme of the utility model described hoist connected with ball joint, wherein: the ball joint connecting assembly includes nut fixed block, ball head fixed plate and ball joint, the ball joint includes ball head and ball head rod, the ball nut is fixedly connected with the nut fixed block, the ball head fixed plate is fixedly connected with the carrier, the ball head is inserted into the nut fixed block after passing through the ball head fixed plate, for releasing the internal stress that ball screw pair bears, the ball head rod is fixedly connected with the carrier.

[0007] As a preferred scheme of the utility model described hoist connected with ball joint, wherein: nut fixed block is equipped with assembly hole and first threaded hole for installing ball nut, the assembly hole is open type, just loosen the installation screw of ball nut, can separate ball screw with nut fixed block and remove it, reduce maintenance difficulty, the back of nut fixed block is symmetrically equipped with two waist type holes matched with ball head.

[0008] As a preferred scheme of the utility model described hoist connected with ball joint, wherein: the tail of ball head rod is equipped with second threaded hole, so as to be fixedly connected with ball joint on carrier by screw.

[0009] As a preferred scheme of the utility model described hoist connected with ball joint, wherein: the two sides of ball head fixed plate are symmetrically equipped with two oval holes matched with ball head rod, so that the stress load that carrier exerts to ball joint can be transmitted to ball head fixed plate, so as to avoid screw of tail of ball joint from being damaged due to stress, improve structural strength, the middle of ball head fixed plate is symmetrically equipped with third threaded hole, so as to install ball head fixed plate to carrier, pin hole is further provided on ball head fixed plate, so as to install positioning.

[0010] As a preferred scheme of the ball joint connected elevator, two groups of linear guide rail pairs are symmetrically arranged on the left and right sides of the frame, the linear guide rail pair comprises a vertical guide rail and a sliding block, the vertical guide rail is arranged on the frame, the sliding block is arranged on the vertical guide rail, and the sliding block is connected with the carrier to play a certain guiding and supporting role for the carrier.

[0011] As a preferred scheme of the ball joint connected elevator, the driving assembly comprises a servo motor, two pulleys and a synchronous belt, the servo motor is arranged at the bottom of the frame, the two pulleys are arranged on the output end of the servo motor and the ball screw respectively, and the synchronous belt is arranged on the two pulleys to drive the ball screw to rotate.

[0012] Beneficial effects:

[0013] 1. By installing the ball joint connecting assembly between the carrier and the ball nut, the soft connection between the carrier and the ball nut is realized, so that the wear and failure of the ball screw pair due to the internal stress that cannot be released is avoided, and the safety of the elevator is ensured.

[0014] 2. The ball joint connection adopted by the elevator can effectively release the internal stress of the ball screw pair, thereby reducing the load torque of the driving servo motor, greatly reducing the failure rate of the equipment, and reducing the difficulty of maintenance of the equipment in the later period.

[0015] 3. Since the ball joint connection is adopted in the elevator, the non-fixed floating cooperation between the carrier and the ball nut is realized, so that the errors in the running process and the early processing and assembly process are eliminated, no overload is generated on the screw nut mechanism, high-precision assembly is not required, and the process of using a three-coordinate measuring instrument for calibration during installation is saved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0017] Fig. 1 It is the overall structure schematic diagram of the ball joint connected elevator.

[0018] Fig. 2 It is another angle structure schematic diagram of the ball joint connected elevator.

[0019] Fig. 3 Position structure diagram of ball nut, ball screw and ball joint connecting assembly of lifting machine connected by ball joint.

[0020] Fig. 4 Position structure diagram of ball head fixing plate, ball joint and nut fixing block of lifting machine connected by ball joint.

[0021] Fig. 5 Structure diagram of nut fixing block of lifting machine connected by ball joint.

[0022] Fig. 6 Structure diagram of ball joint of lifting machine connected by ball joint.

[0023] Fig. 7 Structure diagram of ball head fixing plate of lifting machine connected by ball joint.

[0024] In the figure: 1, frame; 2, linear guide pair; 21, vertical guide rail; 22, sliding block; 3, carrier; 4, ball joint connecting assembly; 41, nut fixing block; 411, assembly hole; 412, first threaded hole; 413, waist-shaped hole; 42, ball joint; 421, ball head; 422, ball head rod; 423, second threaded hole; 43, ball head fixing plate; 431, elliptical hole; 432, third threaded hole; 433, pin hole; 5, ball nut; 6, upper bearing seat; 7, lower bearing seat; 8, ball screw; 9, driving assembly; 91, servo motor; 92, pulley; 93, synchronous belt. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0026] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in other ways that are not consistent with the description herein, and those skilled in the art can make similar generalizations without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0027] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. In this specification, "in one embodiment" does not mean the same embodiment, nor is it an independent or alternative embodiment that excludes other embodiments.

[0028] EMBODIMENT

[0029] REFERENCE Figs. 1-7The embodiment provides a ball-joint connected lifting machine, which comprises a frame 1, a carrier 3, an upper bearing seat 6, a lower bearing seat 7, a ball screw 8, a ball nut 5, a ball-joint connecting assembly 4 and a driving assembly 9 which are arranged on the frame 1, the upper bearing seat 6 and the lower bearing seat 7 are symmetrically arranged on the upper and lower sides of the frame 1, the ball screw 8 is arranged on the upper bearing seat 6 and the lower bearing seat 7, the ball nut 5 is sleeved on the ball screw 8, the carrier 3 is connected with the ball nut 5 through the ball-joint connecting assembly 4, and the driving assembly 9 drives the ball screw 8 to rotate.

[0030] The frame 1 is in an L-shaped structure and is welded by square tubes and steel plates, serves as a mounting base of the lifting machine, and is provided with the carrier 3, the carrier 3 in the embodiment is a lifting wire body, the side plate of the lifting wire body is connected with the linear guide rail pair 2 and the ball-joint connecting assembly 4, and bears the upward and downward movement of materials, the upper bearing seat 6 and the lower bearing seat 7 are symmetrically arranged on the upper and lower sides of the frame 1, the two ends of the ball screw 8 are rotatably arranged on the upper bearing seat 6 and the lower bearing seat 7, the ball nut 5 is sleeved on the ball screw 8, so that the ball screw 8 can drive the ball nut 5 to move upward and downward along the ball screw 8, the ball-joint connecting assembly 4 is arranged between the carrier 3 and the ball nut 5, the soft connection between the carrier 3 and the ball nut 5 is realized, so as to release the internal stress borne by the ball screw pair, and the safety of the lifting machine is ensured, and the driving assembly 9 is arranged at the bottom of the ball screw 8, and the driving assembly 9 is used for driving the ball screw 8 to rotate.

[0031] Specifically, the ball-joint connecting assembly 4 comprises a nut fixing block 41, a ball head fixing plate 43 and a ball joint 42, the ball joint 42 comprises a ball head part 421 and a ball head rod 422, the ball nut 5 is fixedly connected with the nut fixing block 41, the ball head fixing plate 43 is fixedly connected with the carrier 3, the ball head part 421 is inserted into the nut fixing block 41 after penetrating through the ball head fixing plate 43, and is used for releasing the internal stress borne by the ball screw pair, and the ball head rod 422 is fixedly connected with the carrier 3.

[0032] The ball joint connecting assembly 4 in the embodiment mainly comprises a nut fixing block 41, a ball head fixing plate 43 and a ball joint 42. The nut fixing block 41 is mainly made of high-strength metal material and is quenched and tempered, and the hardness can reach HRC 28-32 or above. The ball nut 5 is fixedly installed on the nut fixing block 41 through a screw. The ball head fixing plate 43 is fixedly installed on the carrier 3 through a screw, so as to fixedly support the ball joint 42. The ball head fixing plate 43 is mainly made of high-strength metal plate and is quenched and tempered, and the hardness can reach HRC 28-32 or above. The ball joint 42 is made of GCr15, and the hardness can reach HR58-62 or above after quenching. The ball joint 42 mainly comprises a ball head part 421 and a ball head rod 422. The ball head part 421 is inserted into the nut fixing block 41 through the ball head fixing plate 43, and is used for releasing the internal stress borne by the ball screw pair. The tail of the ball head rod 422 is fixedly installed on the carrier 3. It should be noted that the ball head fixing plate 43 and the nut fixing block 41 are not directly connected, but a gap is kept therebetween, so as to avoid the internal stress caused by the installation error of the ball head fixing plate 43 on the carrier 3 from damaging the normal work of the ball joint connecting assembly 4.

[0033] Further, the nut fixing block 41 is provided with an assembly hole 411 and a first threaded hole 412 for installing the ball nut 5. The assembly hole 411 is of an open type. Two waist-shaped holes 413 are symmetrically provided on the back surface of the nut fixing block 41 and matched with the ball head part 421.

[0034] In the embodiment, the assembly hole 411 is of an open type. As long as the installation screw of the ball nut 5 is loosened, the ball screw 8 can be separated from the nut fixing block 41 and removed, so that the difficulty of later maintenance is reduced. Two waist-shaped holes 413 are symmetrically provided on the back surface of the nut fixing block 41 and matched with the ball head part 421, so that the ball head part 421 is inserted into the waist-shaped hole 413. The contact surface between the ball head rod 422 of the ball joint 42 and the inner wall of the waist-shaped hole 413 is a load bearing surface. It should be noted that the ball head part 421 is in contact with the inner wall of the waist-shaped hole 413, that is, the spherical surface is in contact with the flat surface, which is point contact. After a long running time, the ball head part 421 will be slightly worn and needs to be replaced regularly.

[0035] Further, the tail of the ball head rod 422 is provided with a second threaded hole 423.

[0036] The second threaded hole 423 is arranged at the tail of the ball head rod 422 of the ball joint 42, so that the ball joint 42 is fixedly installed on the carrier 3 by a screw. In other embodiments, the ball joint 42 can also be fixed with the carrier 3 in other suitable connection forms.

[0037] Further, two oval holes 431 symmetrical to the ball head rod 422 are arranged on the two sides of the ball head fixing plate 43, and a third threaded hole 432 is arranged in the middle of the ball head fixing plate 43. The pin hole 433 is also arranged on the ball head fixing plate 43.

[0038] In this embodiment, two oval holes 431 are arranged on the two sides of the ball head fixing plate 43, which are matched with the ball head rod 422. The ball head fixing plate 43 is installed on the ball head rod 422 of the ball joint 42 through the oval holes 431, so that the stress load applied by the carrier 3 to the ball joint 42 can be transmitted to the ball head fixing plate 43, thereby avoiding damage to the screw at the tail of the ball joint 42 due to stress, improving the structural strength. A third threaded hole 432 is arranged in the middle of the ball head fixing plate 43, so that the ball head fixing plate 43 is fixedly installed on the carrier 3 by a screw. The pin hole 433 is also arranged on the ball head fixing plate 43, so that the ball head fixing plate 43 is positioned by a pin during installation, facilitating installation.

[0039] Further, two groups of linear guide rail pairs 2 are symmetrically arranged on the left and right sides of the frame 1. The linear guide rail pair 2 includes a vertical guide rail 21 and a sliding block 22. The vertical guide rail 21 is arranged on the frame 1, and the sliding block 22 is arranged on the vertical guide rail 21. The sliding block 22 is connected with the carrier 3.

[0040] In this embodiment, two groups of linear guide rail pairs 2 are symmetrically arranged on the left and right sides of the frame 1. The linear guide rail pair 2 mainly includes a vertical guide rail 21 and a sliding block 22. The vertical guide rail 21 is vertically fixedly installed on the frame 1, and the sliding block 22 is slidingly installed on the vertical guide rail 21, so as to ensure that the sliding block 22 can slide up and down along the vertical guide rail 21. The carrier 3 is fixedly installed on the sliding block 22, so that the carrier 3 can move up and down along the vertical guide rail 21, and the carrier 3 is guided and supported.

[0041] Specifically, the driving assembly 9 includes a servo motor 91, two pulleys 92 and a synchronous belt 93. The servo motor 91 is arranged at the bottom of the frame 1. The two pulleys 92 are arranged on the output end of the servo motor 91 and the ball screw 8 respectively. The synchronous belt 93 is arranged on the two pulleys 92.

[0042] The driving assembly 9 in the embodiment mainly comprises a servo motor 91, two pulleys 92 and a synchronous belt 93. The servo motor 91 is vertically installed at the bottom of the back of the frame 1. One of the pulleys 92 is installed on the output end of the servo motor 91, and the other pulley 92 is installed on the bottom of the ball screw 8. The synchronous belt 93 is sleeved on the two pulleys 92. The servo motor 91 drives the pulley 92 to rotate, and the pulley 92 drives the ball screw 8 to rotate through the synchronous belt 93. The ball screw 8 drives the ball nut 5 to move up and down. The ball nut 5 drives the carrier 3 to move up and down through the ball joint connection assembly 4. Since the ball joint connection assembly 4 is used to connect the carrier 3 and the ball nut 5 in the embodiment, the internal stress of the ball screw 8 pair is effectively released, the friction force received by the whole ball screw 8 pair is reduced, the load torque of the servo motor 91 is reduced, the failure rate of the equipment is greatly reduced, the maintenance difficulty of the equipment in the later period is also reduced, and the load torque of the servo motor 91 of the elevator with the ball joint connection assembly 4 is sharply reduced from more than 140 N·m to less than 60 N·m through actual project test.

[0043] In the initial state, the carrier 3 is at the bottom of the frame 1. The material to be conveyed is carried to the carrier 3. After the sensor detects that the material is in place, the servo motor 91 is started. The servo motor 91 drives the synchronous belt 93 to move through the pulley 92. The synchronous belt 93 drives the ball screw 8 to rotate. The ball screw 8 drives the ball nut 5 to move up and down. The ball nut 5 drives the nut fixed block 41 to move. The nut fixed block 41 drives the carrier 3 to move up and down through the ball joint 42. At the same time, the linear guide pair 2 on both sides of the carrier 3 also balances the movement in the constrained range, so as to realize safe conveying of goods. When the carrier 3 moves up and down driven by the ball nut 5, the driving force transmitted by the servo motor 91 is transmitted to the ball joint 42 through the nut fixed block 41. The ball head 421 of the ball joint 42 is inserted into the waist-shaped hole 413 of the nut fixed block 41. Therefore, the ball head 421 and the nut fixed block 41 are in spherical surface and plane contact and are not fixed, that is, they are soft connections. The ball head rod 422 of the ball joint 42 is fixedly connected with the carrier 3. Therefore, in this process, the ball joint 42 simultaneously bears the force of the load end and the driving end. Since it is floating spherical surface contact, the internal stress of the load will cause the ball joint 42 to slightly rotate, so that the internal stress can be effectively released. In the traditional rigid connection, the internal stress cannot be released due to machining and assembly errors, which will cause great stress on the ball nut 5. Long-term operation of the ball nut 5 and the ball screw 8 will cause different degrees of wear and failure. The ball joint connection assembly 4 used in the embodiment can effectively release the internal stress, reduce the load of the servo motor 91, prolong the service life of the ball screw 8 pair, and reduce the maintenance difficulty.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A hoist connected by a ball joint, characterized by: The utility model provides a kind of ball head joint connecting assembly, including frame (1) and be located on the carrier (3) of frame, upper bearing seat (6), lower bearing seat (7), ball screw (8), ball nut (5), ball head joint connecting assembly (4) and drive assembly (9), the upper bearing seat (6) and lower bearing seat (7) are symmetrically arranged in the upper and lower sides of the frame (1), the ball screw (8) is arranged on the upper bearing seat (6) and lower bearing seat (7), the ball nut (5) is sleeved on the ball screw (8), the carrier (3) is connected with the ball nut (5) by the ball head joint connecting assembly (4), the drive assembly (9) drives the ball screw (8) rotation.

2. The lifter with a ball joint connection of claim 1, characterized in that: The ball head joint connecting assembly (4) includes nut fixed block (41), ball head fixed plate (43) and ball head joint (42), the ball head joint (42) includes ball head (421) and ball head rod (422), the ball nut (5) is fixedly connected with the nut fixed block (41), the ball head fixed plate (43) is fixedly connected with the carrier (3), the ball head (421) is inserted into the nut fixed block (41) after passing through the ball head fixed plate (43), for releasing the internal stress borne by ball screw pair, the ball head rod (422) is fixedly connected with the carrier (3).

3. The lifter with a ball joint connection of claim 2, characterized in that: The nut fixed block (41) is provided with an assembly hole (411) for mounting the ball nut (5) and a first threaded hole (412), the assembly hole (411) is of open type, and the back surface of the nut fixed block (41) is symmetrically provided with two waist-shaped holes (413) matched with the ball head (421).

4. The lifter with a ball joint connection of claim 3, characterized in that: The tail of the ball head rod (422) is provided with a second threaded hole (423).

5. The lifter connected by a ball joint as defined in claim 4, wherein: The ball head fixed plate (43) is symmetrically provided with two elliptical holes (431) matched with the ball head rod (422) on both sides, and is symmetrically provided with a third threaded hole (432) in the middle, and is further provided with a pin hole (433).

6. The lifter connected by a ball joint as defined in claim 1, wherein: The frame (1) is symmetrically provided with two groups of linear guide pairs (2) on the left and right sides, the linear guide pair (2) includes a vertical guide rail (21) and a sliding block (22), the vertical guide rail (21) is arranged on the frame (1), and the sliding block (22) is arranged on the vertical guide rail (21), and the sliding block (22) is connected with the carrier (3).

7. The lifter connected by a ball joint as defined in claim 1 wherein: The drive assembly (9) includes a servo motor (91), two pulleys (92) and a synchronous belt (93), the servo motor (91) is arranged at the bottom of the frame (1), the two pulleys (92) are arranged on the output end of the servo motor (91) and the ball screw (8) respectively, and the synchronous belt (93) is arranged on the two pulleys (92).

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